@mario-rafael-herrera-vaca Just meant was that the only TripleA version that you played the game with. I believe there was a bug in 1.9.0.0.7527 which can cause the save game to become corrupted when playing the AI. Please upgrade to the latest version (1.9.0.0.7621): http://triplea-game.org/download/

That won't fix your existing save game but you shouldn't see the error occur in any new games.